Emergence of a Non-Van der Waals Magnetic Phase in a Van der Waals Ferromagnet
Bikash Das
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorSubrata Ghosh
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorShamashis Sengupta
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, 91405 France
Search for more papers by this authorPascale Auban-Senzier
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405 France
Search for more papers by this authorMiguel Monteverde
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405 France
Search for more papers by this authorTamal Kumar Dalui
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorTanima Kundu
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorRafikul Ali Saha
Department of Microbial and Molecular Systems, Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001 Belgium
Search for more papers by this authorSujan Maity
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorRahul Paramanik
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorAnudeepa Ghosh
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorMainak Palit
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorJayanta K. Bhattacharjee
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorRajib Mondal
UGC-DAE Consortium for Scientific Research, Kolkata Centre, Bidhannagar, Kolkata, 700 106 India
Search for more papers by this authorCorresponding Author
Subhadeep Datta
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Email: [email protected]
Search for more papers by this authorBikash Das
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorSubrata Ghosh
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorShamashis Sengupta
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, 91405 France
Search for more papers by this authorPascale Auban-Senzier
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405 France
Search for more papers by this authorMiguel Monteverde
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405 France
Search for more papers by this authorTamal Kumar Dalui
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorTanima Kundu
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorRafikul Ali Saha
Department of Microbial and Molecular Systems, Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001 Belgium
Search for more papers by this authorSujan Maity
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorRahul Paramanik
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorAnudeepa Ghosh
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorMainak Palit
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorJayanta K. Bhattacharjee
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Search for more papers by this authorRajib Mondal
UGC-DAE Consortium for Scientific Research, Kolkata Centre, Bidhannagar, Kolkata, 700 106 India
Search for more papers by this authorCorresponding Author
Subhadeep Datta
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032 India
Email: [email protected]
Search for more papers by this authorAbstract
Manipulation of long-range order in 2D van der Waals (vdW) magnetic materials (e.g., CrI3, CrSiTe3 ,etc.), exfoliated in few-atomic layer, can be achieved via application of electric field, mechanical-constraint, interface engineering, or even by chemical substitution/doping. Usually, active surface oxidation due to the exposure in the ambient condition and hydrolysis in the presence of water/moisture causes degradation in magnetic nanosheets that, in turn, affects the nanoelectronic /spintronic device performance. Counterintuitively, the current study reveals that exposure to the air at ambient atmosphere results in advent of a stable nonlayered secondary ferromagnetic phase in the form of Cr2Te3 (TC2 ≈160 K) in the parent vdW magnetic semiconductor Cr2Ge2Te6 (TC1 ≈69 K). The coexistence of the two ferromagnetic phases in the time elapsed bulk crystal is confirmed through systematic investigation of crystal structure along with detailed dc/ac magnetic susceptibility, specific heat, and magneto-transport measurement. To capture the concurrence of the two ferromagnetic phases in a single material, Ginzburg-Landau theory with two independent order parameters (as magnetization) with a coupling term can be introduced. In contrast to the rather common poor environmental stability of the vdW magnets, the results open possibilities of finding air-stable novel materials having multiple magnetic phases.
Conflict of Interest
The authors declare no conflict of interest.
Open Research
Data Availability Statement
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
Supporting Information
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